Bioclim variables have become a core component of the species distribution modelling tool kit. The Bioclim registry contains the core set of 19 variables (temperature and precipitation), an extended set of 16 additional variables (solar radiation and soil moisture), and a growing list of new Bioclim variables at a global extent. Download Bioclim variables in ASCII or ESRI grid format and find out more about how these variables are calculated.

The ExDet tool is an informative means of exploring novelty within correlative species distribution model projections. The tool measures the similarity between two regions by accounting for both the deviation from the mean and the correlation between variables. The tool also provides an assessment of the most influential variables leading to dissimilarity.

The Köppen-Geiger climate classification system partitions the world into biogeographically informative units that are useful for a range of modelling questions. Download the original 1936 publication here, as well as global Köppen-Geiger layers for the CliMond and Worldclim datasets.